✨我的mybatis从oracle迁移转换mysql的差异【原】
仅此作为笔记
分页差异
oracle |
<select id="select" parameterClass="java.util.Map" resultClass="com.bobo.code.model.LoginMember"> select * from (select ROWNUM rn , D.* FROM ( select <include refid= "selectSql" ></include> <include refid= "pageCondition" ></include> order by A.t_crt_tm DESC ) D <![CDATA[ WHERE ROWNUM <= #maxRowNum:VARCHAR# ]]> ) <![CDATA[ WHERE rn > #minRowNum:VARCHAR# ]]> </select>
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mysql |
<select id="select" parameterClass="java.util.Map" resultClass="com.bobo.code.model.LoginMember"> select <include refid= "selectSql" ></include> <include refid= "pageCondition" ></include> limit #minRowNum:VARCHAR# , #pageSize:VARCHAR# </select>
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因为oracle分页需要3个select 达到最佳性能,具体原因自行百度
而mysql分页基本语句如下
收到客户端{pageNo:1,pagesize:10} select * from table limit (pageNo-1)*pageSize, pageSize; 收到客户端{pageNo:5,pageSize:30} select * from table limit (pageNo-1)*pageSize,pageSize;
所以仔细分析差异后, 还是使用oracle的参数,那么mysql的分页条件就变成
表名差异
oracle是不关心表名大小写的, 但是mysql却大小写敏感
oracle | mysql |
INSERT INTO WEB_KING_LOGIN_MEMBER | INSERT INTO web_king_login_member |
日期差异
oracle | mysql timestamp |
sysdate | now() |
TO_CHAR(t_crt_tm, 'YYYY-MM-DD HH24:MI:SS') AS tCrtTm, | FROM_UNIXTIME( UNIX_TIMESTAMP(t_upd_tm) , '%Y-%m-%d %H:%i:%s') AS tCrtTm, |
A.t_crt_tm = TO_DATE(#cCrtTm:VARCHAR#,'yyyy-mm-dd hh24:mi:ss'); | A.t_crt_tm = unix_timestamp(#cCrtTm:VARCHAR#); |
uuid差异
oracle | mysql |
SYS_GUID() | REPLACE(UUID(),"-","") |
like差异
oracle | mysql |
A.c_desc like '%' || #cDesc:VARCHAR# || '%'
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A.c_desc like concat('%', #cDesc:VARCHAR#, '%')
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其它差异
MySQL与Oracle 差异比较之三函数=>https://www.cnblogs.com/HondaHsu/p/3641190.html
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